@extends('layouts.app')

@section('title', 'Chat')

@section('content')
<div class="max-w-7xl mx-auto">
    <!-- Header -->
    <div class="mb-6 flex justify-between items-center">
        <div>
            <h1 class="text-2xl font-bold text-gray-900">Messages</h1>
            <p class="mt-1 text-sm text-gray-600">
                @php
                    $otherUser = $chat->buyer_id === auth()->id() ? $chat->seller : $chat->buyer;
                @endphp
                Chat with {{ $otherUser->name }}
            </p>
        </div>
        <a href="{{ route('chats.index') }}" 
           class="bg-gray-600 hover:bg-gray-700 text-white px-4 py-2 rounded-md text-sm font-medium flex items-center">
            <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 19l-7-7m0 0l7-7m-7 7h18" />
            </svg>
            Back to Conversations
        </a>
    </div>

    <div class="bg-white rounded-lg shadow">
        <div class="grid grid-cols-1 lg:grid-cols-4 h-[70vh]">
            <!-- Conversations List -->
            <div class="lg:col-span-1 border-r border-gray-200">
                <div class="p-4 border-b border-gray-200">
                    <h2 class="text-lg font-medium text-gray-900">Conversations</h2>
                </div>
                
                <div class="overflow-y-auto h-full">
                    @if($allChats->count() > 0)
                        <div class="divide-y divide-gray-200">
                            @foreach($allChats as $conversation)
                                @php
                                    $conversationOtherUser = $conversation->buyer_id === auth()->id() ? $conversation->seller : $conversation->buyer;
                                    $unreadCount = $conversation->unreadMessages()->count();
                                @endphp
                                <a href="{{ route('chats.show', $conversation) }}" 
                                   class="block p-4 hover:bg-gray-50 transition-colors duration-200 {{ $conversation->id === $chat->id ? 'bg-blue-50 border-r-2 border-blue-500' : '' }}">
                                    <div class="flex items-start space-x-3">
                                        <!-- User Avatar -->
                                        <div class="flex-shrink-0">
                                            <div class="h-10 w-10 rounded-full bg-green-100 flex items-center justify-center">
                                                <span class="text-green-600 font-medium text-sm">
                                                    {{ strtoupper(substr($conversationOtherUser->name, 0, 1)) }}
                                                </span>
                                            </div>
                                        </div>
                                        
                                        <!-- Conversation Details -->
                                        <div class="flex-1 min-w-0">
                                            <div class="flex items-center justify-between">
                                                <p class="text-sm font-medium text-gray-900 truncate">
                                                    {{ $conversationOtherUser->name }}
                                                    @if($conversationOtherUser->company_name)
                                                        <span class="text-gray-500">({{ $conversationOtherUser->company_name }})</span>
                                                    @endif
                                                </p>
                                                @if($conversation->last_message_at)
                                                    <span class="text-xs text-gray-500 whitespace-nowrap">
                                                        {{ $conversation->last_message_at->diffForHumans() }}
                                                    </span>
                                                @endif
                                            </div>
                                            
                                            <p class="text-sm text-gray-600 truncate mt-1">
                                                @if($conversation->last_message)
                                                    {{ Str::limit($conversation->last_message, 40) }}
                                                @else
                                                    <span class="text-gray-400">No messages yet</span>
                                                @endif
                                            </p>

                                            <!-- Unread Badge -->
                                            @if($unreadCount > 0 && $conversation->id !== $chat->id)
                                                <div class="mt-1">
                                                    <span class="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-red-100 text-red-800">
                                                        {{ $unreadCount }} unread
                                                    </span>
                                                </div>
                                            @endif
                                        </div>
                                    </div>
                                </a>
                            @endforeach
                        </div>
                    @else
                        <div class="text-center py-12">
                            <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                            </svg>
                            <h3 class="mt-2 text-sm font-medium text-gray-900">No conversations</h3>
                            <p class="mt-1 text-sm text-gray-500">
                                Start a conversation from the marketplace.
                            </p>
                        </div>
                    @endif
                </div>
            </div>

            <!-- Chat Area -->
            <div class="lg:col-span-3 flex flex-col">
                <!-- Chat Header -->
                <div class="border-b border-gray-200 p-4">
                    <div class="flex items-center justify-between">
                        <div class="flex items-center space-x-3">
                            <div class="flex-shrink-0">
                                <div class="h-10 w-10 rounded-full bg-green-100 flex items-center justify-center">
                                    <span class="text-green-600 font-medium text-sm">
                                        {{ strtoupper(substr($otherUser->name, 0, 1)) }}
                                    </span>
                                </div>
                            </div>
                            <div>
                                <h3 class="text-lg font-medium text-gray-900">
                                    {{ $otherUser->name }}
                                    @if($otherUser->company_name)
                                        <span class="text-gray-600">({{ $otherUser->company_name }})</span>
                                    @endif
                                </h3>
                                <p class="text-sm text-gray-500">
                                    {{ auth()->user()->isBuyer() ? 'Seller' : 'Buyer' }}
                                </p>
                            </div>
                        </div>
                        
                        <!-- Product Info -->
                        <div class="text-right">
                            <p class="text-sm font-medium text-gray-900">About Product</p>
                            <a href="{{ route('marketplace.show', $chat->product) }}" 
                               class="text-sm text-blue-600 hover:text-blue-500 truncate max-w-xs inline-block">
                                {{ $chat->product->name }}
                            </a>
                            <p class="text-sm text-gray-500">${{ number_format($chat->product->price, 2) }}</p>
                        </div>
                    </div>
                </div>

                <!-- Messages Area -->
                <div id="messages-container" class="flex-1 overflow-y-auto p-4 space-y-4 bg-gray-50">
                    @if($messages->count() > 0)
                        <div class="space-y-4">
                            @foreach($messages->reverse() as $message)
                                <div class="flex {{ $message->sender_id === auth()->id() ? 'justify-end' : 'justify-start' }}">
                                    <div class="max-w-xs lg:max-w-md px-4 py-2 rounded-lg {{ $message->sender_id === auth()->id() ? 'bg-blue-600 text-white' : 'bg-white border border-gray-200 text-gray-900' }}">
                                        <p class="text-sm">{{ $message->message }}</p>
                                        <div class="flex items-center justify-between mt-1">
                                            <span class="text-xs {{ $message->sender_id === auth()->id() ? 'text-blue-100' : 'text-gray-500' }}">
                                                {{ $message->created_at->format('g:i A') }}
                                            </span>
                                            @if($message->sender_id === auth()->id() && $message->is_read)
                                                <svg class="w-4 h-4 text-blue-300 ml-2" fill="currentColor" viewBox="0 0 20 20">
                                                    <path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"/>
                                                </svg>
                                            @endif
                                        </div>
                                    </div>
                                </div>
                            @endforeach
                        </div>
                    @else
                        <div class="text-center py-8">
                            <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                            </svg>
                            <h3 class="mt-2 text-sm font-medium text-gray-900">No messages yet</h3>
                            <p class="mt-1 text-sm text-gray-500">Start the conversation by sending a message.</p>
                        </div>
                    @endif
                </div>

                <!-- Message Input -->
                <div class="border-t border-gray-200 p-4">
                    <form id="message-form" action="{{ route('chats.messages.store', $chat) }}" method="POST">
                        @csrf
                        <div class="flex space-x-4">
                            <div class="flex-1">
                                <input type="text" 
                                       name="message" 
                                       id="message-input"
                                       placeholder="Type your message..."
                                       required
                                       class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                                       autocomplete="off">
                            </div>
                            <button type="submit"
                                    class="bg-blue-600 hover:bg-blue-700 text-white px-6 py-2 rounded-lg font-medium flex items-center transition-colors">
                                <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 19l9 2-9-18-9 18 9-2zm0 0v-8"/>
                                </svg>
                                Send
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>

    <!-- Pagination -->
    @if($messages->count() > 0)
        <div class="mt-4">
            {{ $messages->links() }}
        </div>
    @endif
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const messagesContainer = document.getElementById('messages-container');
    const messageForm = document.getElementById('message-form');
    const messageInput = document.getElementById('message-input');

    // Scroll to bottom of messages
    function scrollToBottom() {
        messagesContainer.scrollTop = messagesContainer.scrollHeight;
    }

    // Handle form submission
    messageForm.addEventListener('submit', function(e) {
        e.preventDefault();
        
        const message = messageInput.value.trim();
        if (!message) return;

        // Add temporary message to UI
        addTemporaryMessage(message);
        
        // Clear input
        messageInput.value = '';
        
        // Send message via AJAX
        fetch(this.action, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-CSRF-TOKEN': '{{ csrf_token() }}'
            },
            body: JSON.stringify({
                message: message
            })
        })
        .then(response => response.json())
        .then(data => {
            if (data.success) {
                // Remove temporary message and let real-time update handle it
                removeTemporaryMessage();
                // Reload the page to show the new message
                window.location.reload();
            }
        })
        .catch(error => {
            console.error('Error sending message:', error);
            removeTemporaryMessage();
            alert('Failed to send message. Please try again.');
        });
    });

    // Add temporary message to UI
    function addTemporaryMessage(message) {
        const tempId = 'temp-' + Date.now();
        const messageHTML = `
            <div id="${tempId}" class="flex justify-end">
                <div class="max-w-xs lg:max-w-md px-4 py-2 rounded-lg bg-blue-600 text-white opacity-75">
                    <p class="text-sm">${message}</p>
                    <div class="flex items-center justify-between mt-1">
                        <span class="text-xs text-blue-100">Sending...</span>
                    </div>
                </div>
            </div>
        `;
        messagesContainer.innerHTML += messageHTML;
        scrollToBottom();
    }

    // Remove temporary message
    function removeTemporaryMessage() {
        const tempMessages = document.querySelectorAll('[id^="temp-"]');
        tempMessages.forEach(msg => msg.remove());
    }

    // Auto-focus message input
    messageInput.focus();

    // Scroll to bottom on load
    scrollToBottom();
});
</script>
@endsection